EP2977847B1 - Ventilanordnung - Google Patents

Ventilanordnung Download PDF

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Publication number
EP2977847B1
EP2977847B1 EP14178346.4A EP14178346A EP2977847B1 EP 2977847 B1 EP2977847 B1 EP 2977847B1 EP 14178346 A EP14178346 A EP 14178346A EP 2977847 B1 EP2977847 B1 EP 2977847B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve element
arrangement according
stationary
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP14178346.4A
Other languages
English (en)
French (fr)
Other versions
EP2977847A1 (de
Inventor
Marc Francis Byrne
Bojan Gjerek
Peter Nose
Tomaz Zagar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss AS
Original Assignee
Danfoss AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Danfoss AS filed Critical Danfoss AS
Priority to EP14178346.4A priority Critical patent/EP2977847B1/de
Publication of EP2977847A1 publication Critical patent/EP2977847A1/de
Application granted granted Critical
Publication of EP2977847B1 publication Critical patent/EP2977847B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0106—Control of flow without auxiliary power the sensing element being a flexible member, e.g. bellows, diaphragm, capsule

Definitions

  • the present invention relates to a valve arrangement comprising a housing having an inlet, an outlet, a flow control valve between said inlet and said outlet, and a pressure control valve having a movable valve element and a stationary valve element and keeping constant a pressure over said flow control valve.
  • Such a valve arrangement is known, for example, from EP 1 353 254 A2 .
  • the pressure control valve comprises a piston forming said movable valve element.
  • the piston is loaded by a pressure at the outlet in one direction and by a pressure in a pressure chamber in the opposite direction.
  • the movable valve element together with the stationary valve element throttles the flow of the fluid through the valve arrangement so that a pressure difference over the flow control valve is kept constant independently of the pressures at the inlet and the outlet.
  • US3344805 shows an automatic flow rate regulator comprising a metering valve, a cylindrical casing closed by a bonnet, and a piston, the piston moving so that the differential pressure across a metering orifice of the metering valve is balanced by the force of a spring.
  • the object underlying the invention is to provide for a valve arrangement having a simple construction.
  • This object is solved in a valve arrangement described at the outset in that said pressure control valve is arranged downstream said flow control valve, wherein said stationary valve element has a form of a cup with a circumferential wall and a closed bottom wall facing said movable valve element, said circumferential wall having at least one through going opening.
  • fluid passing the flow control valve enters the stationary valve element of the pressure control valve, i. e. the cup. Because of the closed bottom wall of the stationary valve element the fluid cannot directly enter the movable valve element but is forced to leave the inside of the cup via the at least one through going opening in the circumferential wall of the stationary valve element to enter a pressure chamber.
  • the fluid can leave the pressure chamber through a gap between the movable valve element and the stationary valve element.
  • the housing can be made of two or more parts, e.g. an upper and a lower part.
  • the pressure control valve controls a differential pressure, so that it could be named “differential pressure control valve” as well. However, in the following the shorter name "pressure control valve” is used.
  • the stationary valve element can have any form of section. Although a circular section is preferred, it can be square, triangular, polygon, or elliptic.
  • the circumferential wall can have interruptions forming said openings.
  • said bottom wall is provided with a ring shaped protrusion on the side facing said movable valve element.
  • This protrusion forms a throttling edge which together with the movable valve element forms a flow resistance for the fluid with which the pressure in the pressure chamber can be influenced, so that the pressure difference between the inlet and the pressure chamber can be kept constant.
  • said ring shaped protrusion has an outer diameter smaller than an inner diameter of said movable valve element.
  • the movable valve element can be moved in a position surrounding said protrusion. In this case a gap between the stationary valve element and the movable valve element can be made rather small.
  • said bottom wall comprises a rounded edge. This prevents the valve element from generating too much noise.
  • said flow control valve comprises a flow control valve element which is arranged within said stationary valve element.
  • the fluid flows through the valve seat of the flow control valve before acting on the valve element of the flow control valve. A sucking effect trying to pull the valve element onto the valve seat of the flow control valve can be avoided.
  • said flow control valve element is connected to a valve rod passing through said bottom wall.
  • the bottom wall of the stationary valve element is still closed since the valve rod of the control valve element is sealed against the bottom wall of the stationary valve element.
  • the valve rod does not have to pass through the valve seat of the flow control element.
  • said valve rod passes through said moveable valve element. This simplifies the construction since the valve rod can be positioned so that an actuator can act directly or indirectly on the valve rod.
  • the valve rod has a function of equalizing the flow through the moveable valve element.
  • said stationary valve element is surrounded by a spring, said spring acting on said movable valve element.
  • the spring creates a force on said movable valve element acting in the same direction as the pressure in the pressure chamber. In the opposite direction the movable valve element is loaded by a pressure at the inlet. Therefore, the spring defines the pressure difference over the flow control valve.
  • said spring is a coil spring having at least one winding crossing the outside of said through going opening. The fluid is forced to flow through the coil spring when leaving the cup shaped stationary valve element.
  • the coil spring is used to ensure an more even distribution of the fluid in the pressure chamber surrounding said stationary valve element.
  • said flow control valve comprises a valve seat positioned at a wall separating said inlet from a pressure chamber, said stationary valve element being stuck into said wall from a side opposite said valve seat.
  • the housing of the valve arrangement can be made of basically two parts, one part comprising the valve seat of the flow control valve and the other part accommodating said movable valve element.
  • a membrane used for moving the movable valve element can be clamped between the two housing parts. In this construction the side of the wall opposite said valve seat is freely accessible when the two parts are separated from each other. Therefore, it is rather simple to mount the stationary valve element.
  • the stationary valve element can be fixed in the housing by means of a press fit or the like.
  • a flow divider is arranged within said stationary valve element. Fluid coming from the inlet and passing the flow control valve often has a flow direction component leading to an uneven distribution of the fluid within the cup shaped stationary valve element.
  • the flow divider is used to distribute the fluid more evenly in the stationary valve element.
  • said flow divider is fixed to said bottom wall. In this way the flow divider can be used to reinforce the bottom wall.
  • said flow divider comprises a triangular longitudinal section.
  • the longitudinal section of the flow divider forms a triangle a tip of which is directed towards the flow control valve.
  • said flow divider protrudes out of said stationary valve element in a direction towards said flow control valve.
  • the flow divider penetrates the valve seat of the flow control valve. This means that the fluid passing the flow control valve is influenced at a very early stage.
  • At least one fluid contacting surface in at least one of said flow control valve and said pressure control valve is a knurled surface. This helps in reducing noise.
  • Figure 1 shows a valve arrangement 1 comprising a housing 2.
  • the housing comprises a first part 3 and a second part 4.
  • An inlet 5 is arranged in the first part 3.
  • An outlet 6 is arranged in the second part 4.
  • a flow control valve comprising a valve element 7 and a valve seat 8 is arranged between the inlet 5 and the outlet 6.
  • the valve element 7 is mounted at an end of a valve rod 9.
  • the valve rod 9 is connected to an actuation pin 10 which can be actuated by means of an actuator (not shown) or by means of a protecting cap 11.
  • a spring 12 is provided loading the valve element 7 in an opening direction, i. e. in a direction away from the valve seat 8.
  • a pressure control valve Downstream the flow control valve 7, 8 a pressure control valve is arranged having a movable valve element 13 and a stationary valve element 14.
  • the movable valve element 13 is connected to a membrane 15.
  • the membrane 15 is clamped between the first part 3 and the second part 4 of the housing 2.
  • the valve seat 8 is positioned at a wall 16 separating the inlet 5 from a pressure chamber 17.
  • the stationary valve element 14 is stuck into said wall 16 from the side opposite the valve seat 8.
  • the pressure chamber 17 is limited by the wall 16, the first part 3 of the housing and the membrane 15.
  • the pressure control valve 13, 14 is arranged downstream the flow control valve 7, 8.
  • the stationary valve arrangement 14 of the pressure control valve has a form of a cup with a circumferential wall 18 and a closed bottom wall 19. As can be seen in figure 1 , the bottom wall 19 faces the movable valve element 13.
  • the stationary valve element 14 has at least one through going opening 20 in the circumferential wall 18. Preferably, a number of openings 20 is provided. Furthermore, the bottom wall 19 is provided with a ring shaped protrusion 21 which is directed in a direction towards the movable valve element 13 as well. Furthermore, the bottom wall 19 of the stationary valve element 14 has a rounded edge 21 a.
  • a spring 22 is arranged between the wall 16 and the membrane 15 acting in a direction moving the movable valve element 13 away from the stationary valve element 14.
  • the spring 22 is a coil spring having at least one winding 23 crossing the outside of the through going opening 20.
  • a fluid entering the interior of the stationary valve element 14 via the flow control valve 7, 8 and leaving the cup shaped stationary valve element 14 through the through going opening 20 has to pass the winding 23 of the coil spring 22.
  • the movable valve element 13 is in form of a hollow cylinder.
  • the cylinder has a circular cross section.
  • the inner diameter of the movable valve element 13 is larger than the outer diameter of the protrusion 21.
  • a flow divider 24 is positioned in the stationary valve element 14.
  • the flow divider 24 is connected to the bottom wall 19 of the stationary valve element 14.
  • the flow divider 24 has a triangular longitudinal section.
  • the flow divider 24 comprises a tip 25 which is directed towards the valve element 7.
  • the flow divider 24 extends through the valve seat 8, i.e. when the valve element 7 rests against the valve seat 8 the valve seat 7 surrounds the tip 25.
  • a pressure channel 26 connects the input 5 with a space 27 on a side of the membrane opposite to the pressure chamber 17.
  • the membrane 15 is loaded by the pressure at the input in a direction towards the stationary valve element 14.
  • the membrane 15 is loaded in the opposite direction by the coil spring 22 and by the pressure in the pressure chamber 17.
  • the pressure in the pressure chamber 17 is lower than the pressure at the input 5 since there is always a pressure drop between the valve element 7 and the valve seat 8 when fluid is flowing through the valve arrangement 1.
  • a further pressure drop occurs in the gap between the movable valve element 13 and the stationary valve element 14.
  • the movable valve element 13 approaches the stationary valve element 14 this pressure drop increases and consequently the pressure in the pressure chamber 17 increases.
  • the movable valve element 13 moves away from the stationary valve element 14 the pressure drop between the movable valve element 13 and the stationary valve element decreases and consequently the pressure and the pressure chamber 17 decreases as well.
  • the movable valve element 13 assumes a position in which the pressure difference over the flow control valve 7, 8 basically corresponds to a force produced by the coil spring 17.
  • Fluid entering the valve arrangement through the inlet 5 often keeps a directional component even after passing the valve element 7 and the valve seat 8.
  • the flow divider 24 equalizes the distribution of the fluid within the cup shaped stationary valve element 14 so that the fluid leaves the stationary valve element through all through going openings 20 in a more evenly distributed manner.
  • the fluid than has to pass the rounded edge 21 a of the stationary valve element 14 and enters the gap between the movable element 14 and the stationary valve element 13. Thereafter, the fluid flows through the hollow interior of the movable valve element 13 and leaves the valve arrangement via the outlet 6.
  • valve element 7 has a knurled surface.
  • the stationary valve element 14 can have a knurled surface as well. Knurled surfaces can be used to reduce noise of the fluid passing the valve arrangement 1.
  • the stationary valve element 14 can easily be mounted in the first part 3 of the housing when the two parts 3, 4 of the housing 2 are separated. In this situation the stationary valve element 14 can be pressed into the wall 16 or connected to the wall 16 in another way.
  • FIG. 3 shows a second embodiment of the valve arrangement in a schematic sectional view.
  • the same elements as in figures 1 and 2 have been designated with the same reference numerals.
  • the flow control valve 7, 8 is arranged upstream the pressure control valve 13, 14, as in the embodiment of figure 1 .
  • the bottom wall 19 of the stationary valve element 14 has a bore 30 through which the valve rod 9 passes.
  • the valve rod 9 is sealed by means of a sealing 31 so that the bottom wall 19 of the stationary valve element 14 can still be considered as closed bottom wall.
  • valve rod 9 passes through the moveable valve element 13.
  • the valve rod is a kind of guide for the fluid flowing through the moveable valve element 13 so that the flow can be equalized.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Details Of Valves (AREA)

Claims (14)

  1. Ventilanordnung (1), umfassend ein Gehäuse (2), das einen Einlass (5), einen Auslass (6), ein Durchflussregelventil (7, 8) zwischen dem Einlass (5) und dem Auslass (6) und ein Differenzdruckregelventil (13, 14) aufweist, das ein bewegliches Ventilelement (13) und ein feststehendes Ventilelement (14) aufweist und eine Druckdifferenz über dem Durchflussregelventil (7, 8) auf einem konstanten Wert hält,
    wobei das Druckregelventil (13, 14) nach dem Durchflussregelventil (7, 8) angeordnet ist und wobei das feststehende Ventilelement (14) die Form eines Bechers mit einer umlaufenden Wand (18) und einer geschlossenen. Bodenwand (19) aufweist, die dem beweglichen Ventilelement (13) zugewandt ist, wobei die umlaufende Wand (18) wenigstens eine Durchgangsöffnung (20) aufweist, dadurch gekennzeichnet, dass das feststehende Ventilelement (14) von einer Feder (22) umgeben ist, wobei die Feder auf das bewegliche Ventilelement (13) wirkt.
  2. Ventilanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Bodenwand (19) mit einem Vorsprung, vorzugsweise einem ringförmigen Vorsprung (21), auf der Seite versehen ist, die dem beweglichen Ventilelement (13) zugewandt ist.
  3. Ventilanordnung nach Anspruch 2, dadurch gekennzeichnet, dass der Vorsprung (21) einen Außendurchmesser aufweist, der geringer als der Innendurchmesser des beweglichen Ventilelements (13) ist.
  4. Ventilanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Bodenwand (19) einen abgerundeten Rand (21a) umfasst.
  5. Ventilanordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Durchflussregelventil (7, 8) ein Durchflussregelventilelement (7) umfasst, das innerhalb des feststehenden Ventilelements (14) angeordnet ist.
  6. Ventilanordnung nach Anspruch 5, dadurch gekennzeichnet, dass das Durchflussregelventilelement (7) mit einer Ventilstange (9) verbunden ist, die durch die Bodenwand (19) hindurchführt.
  7. Ventilanordnung nach Anspruch 6, dadurch gekennzeichnet, dass die Ventilstange (9) durch das bewegliche Ventilelement (13) hindurchführt.
  8. Ventilanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Feder (22) eine Spiralfeder ist, die wenigstens eine Windung (23) aufweist, die die Außenseite der Durchgangsöffnung (20) kreuzt.
  9. Ventilanordnung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Durchflussregelventil (7, 8) einen Ventilsitz (8) umfasst, der an einer Wand (16) positioniert ist, die den Einlass (5) von einer Druckkammer (17) trennt, wobei das feststehende Ventilelement (14) von einer dem Ventilsitz (8) gegenüberliegenden Seite in die Wand (16) eingesteckt ist.
  10. Ventilanordnung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass ein Stromteilventil (24) innerhalb des feststehenden Ventilelements (14) angeordnet ist.
  11. Ventilanordnung nach Anspruch 10, dadurch gekennzeichnet, dass das Stromteilventil (24) an der Bodenwand (19) befestigt ist.
  12. Ventilanordnung nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass das Stromteilventil (24) einen dreieckigen Längsabschnitt umfasst.
  13. Ventilanordnung nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass das Stromteilventil (24) in eine Richtung zu dem Durchflussregelventil (7, 8) aus dem feststehenden Ventilelement (14) hervorragt.
  14. Ventilanordnung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass wenigstens eine mit Flüssigkeit in Kontakt kommende Fläche in dem Durchflussregelventil (7, 8) und/oder dem Druckregelventil (13, 14) eine gerändelte Fläche ist.
EP14178346.4A 2014-07-24 2014-07-24 Ventilanordnung Not-in-force EP2977847B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14178346.4A EP2977847B1 (de) 2014-07-24 2014-07-24 Ventilanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14178346.4A EP2977847B1 (de) 2014-07-24 2014-07-24 Ventilanordnung

Publications (2)

Publication Number Publication Date
EP2977847A1 EP2977847A1 (de) 2016-01-27
EP2977847B1 true EP2977847B1 (de) 2017-04-26

Family

ID=51228313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14178346.4A Not-in-force EP2977847B1 (de) 2014-07-24 2014-07-24 Ventilanordnung

Country Status (1)

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EP (1) EP2977847B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3203344A1 (de) * 2016-02-02 2017-08-09 Danfoss A/S Ventil, insbesondere wärmetauscherventil
FR3048750B1 (fr) * 2016-03-14 2018-07-27 Suntec Industries France Dispositif regulateur de pression d'une vanne gaz

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344805A (en) * 1965-03-24 1967-10-03 Fischer & Porter Co Automatic flow rate control system
US6688319B2 (en) 2002-04-10 2004-02-10 Flow Design, Inc. Flow regulating control valve and method for regulating fluid flow
US7401622B2 (en) * 2006-06-09 2008-07-22 Nelson Irrigation Corporation Modular pressure regulator
JP5425831B2 (ja) * 2011-03-30 2014-02-26 本田技研工業株式会社 締切り機構付き減圧弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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